Theoretical study on seawater temperature and salinity measurement based on Dual-channel Fiber-optic sensor

LIAO Yipeng; HE Xiaoyong; WU Xi

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Theoretical study on seawater temperature and salinity measurement based on Dual-channel Fiber-optic sensor

Optical Sensing and Measurement | 更新时间：2026-01-05

- Theoretical study on seawater temperature and salinity measurement based on Dual-channel Fiber-optic sensor
- OPTICAL TECHNIQUE Vol. 51, Issue 6, Pages: 729-735(2025)
- 作者机构：
  
  1.深圳信息职业技术大学微电子学院，广东深圳 518172
  2.东莞理工学院电信工程与智能化学院，广东东莞 523808
  3.南宁师范大学广西信息功能材料与智能信息处理重点实验室，广西南宁 530004
  4.南宁师范大学物理与电子学院，广西南宁 530004
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN253
- Received：09 May 2025，
  
  Revised：2025-06-28，
  
  Published：20 November 2025
- 稿件说明：
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廖毅鹏,何小勇,吴熙.基于双通道光纤传感器的海水温盐度测量的理论研究[J].光学技术,2025,51(06):729-735.

LIAO Yipeng,HE Xiaoyong,WU Xi.Theoretical study on seawater temperature and salinity measurement based on Dual-channel Fiber-optic sensor[J].OPTICAL TECHNIQUE,2025,51(06):729-735.
廖毅鹏,何小勇,吴熙.基于双通道光纤传感器的海水温盐度测量的理论研究[J].光学技术,2025,51(06):729-735. DOI：

LIAO Yipeng,HE Xiaoyong,WU Xi.Theoretical study on seawater temperature and salinity measurement based on Dual-channel Fiber-optic sensor[J].OPTICAL TECHNIQUE,2025,51(06):729-735. DOI：

摘要

文章提出了一种双通道光纤传感器用于海水温盐度的准确测量。传感器利用光纤马赫-曾德尔干涉仪（MZI）和微光纤模式干涉仪（MMI）结构作为两个传感单元，分别位于光开关的两个通道中，通过建立两个传感单元光谱干涉峰波长与温盐度的关系实现温盐度的同步测量。研究了MZI和MMI的灵敏度特性，通过优化结构参数，建立了具有高灵敏度的传感器理论模型，温盐度传感灵敏度最大值分别达-2.9307nm/˚C和-2.3098nm/‰。对温盐度测量进行了仿真计算，结果表明，在0.1nm和0.02nm两个光谱分辨率下，温度测量平均偏差分别为0.021˚C和0.0151˚C，盐度平均偏差分别为0.0426‰和0.039‰。双通道光纤传感器具有较高的测量准确度，为海水温盐度测量提供了新思路。

Abstract

A dual-channel fiber-optic sensor-based method is proposed to accurately measure seawater temperature and salinity. A fiber-optic Mach-Zehnder interferometer （MZI） and a microfiber mode interferometer （MMI） are used as the sensing units in two channels of an optical switch

and thus the measurement of temperature and salinity can be realized by establishing the relation between the wavelength of spectral interference peak of two sensing units and temperature and salinity. By studying their sensitivity characteristics and optimizing structural parameters

a high-sensitivity sensor theoretical model is established

and the acquired highest sensitivity for temperature and salinity sensing are -2.9307 nm/˚C and -2.3098 nm/‰

respectively. Simulation of seawater temperature and salinity measurement process are carried out

and the results show that at spectral resolutions of 0.1 nm and 0.02 nm

the average temperature measurement deviations are 0.021°C and 0.0151°C

respectively

and the average salinity deviations are 0.0426‰ and 0.039‰. The dual-channel fiber-optic sensor shows high measurement accuracy

providing a new idea for the measurement of seawater temperature and salinity.

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references

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